The laser diode in the traverse deck (optical pickup) may break
down due to potential difference caused by static electricity of
clothes or human body.
So, be careful of electrostatic breakdown during repair of the
traverse deck (optical pickup).
l
Handling of CD traverse deck (optical pickup)
1. Do not subject the traverse deck (optical pickup) to
static electricity as it is extremely sensitive to electrical
shock.
2. The short land between the No.4 (LD) and No.5 (GND)
pins on the flexible board (FFC) is shorted with a solder
build-up to prevent damage to the laser diode.
3. Take care not to apply excessive stress to the flexible
board (FFC board) (Fig 4.1).
4. Do not turn the variable resistor (laser power
adjustment). It has already been adjusted.
Fig 4.1
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Grounding for electrostatic breakdown prevention
1. Human body grounding (Fig 4.2)
Use the anti-static wrist strap to discharge the static
electricity from your body.
2. Work table grounding (Fig 4.2)
Put a conductive material (sheet) or steel sheet on the
area where the traverse deck (optical pickup) is placed,
and ground the sheet.
Caution :
The static electricity of your clothes will not be grounded
through the wrist strap. So, take care not to let your
clothes touch the traverse deck (optical pickup).
Fig 4.2
Caution when Replacing the Optical Pickup :
The traverse has a short point shorted with solder to protect
the laser diode against electrostatics breakdown. Be sure to
remove the solder from the short point before making
connections.
4 Handling Precautions For Traverse Deck
8
SA-PM4E / SA-PM4EB / SA-PM4EG
Summary of Contents for SA-PM4E
Page 4: ...1 2 Caution for AC Cord 4 SA PM4E SA PM4EB SA PM4EG ...
Page 12: ...7 3 Disc Information 12 SA PM4E SA PM4EB SA PM4EG ...
Page 28: ... Replacement of CD Servo P C B 28 SA PM4E SA PM4EB SA PM4EG ...
Page 30: ...10 2 Checking and Repairing of Transformer P C B 30 SA PM4E SA PM4EB SA PM4EG ...
Page 32: ...10 4 Checking and Repairing of Panel and HP Music Port P C B 32 SA PM4E SA PM4EB SA PM4EG ...
Page 38: ...SA PM4E SA PM4EB SA PM4EG 38 ...
Page 42: ...SA PM4E SA PM4EB SA PM4EG 42 ...
Page 44: ...44 SA PM4E SA PM4EB SA PM4EG ...
Page 56: ...SA PM4E SA PM4EB SA PM4EG 56 ...
